fix(status plugin): make sure the latest status is read before manually triggering or returning a snapshot (#7533)

* when manually triggering, make sure the latest status event is registered. Only one status event should exist.
* read bundle status for snapshot as well
* revert back to buffering 1 status event

Signed-off-by: sspaink <sspaink@styra.com>

v1/plugins/status/plugin.go

@@ -24,7 +24,7 @@ import (
 )
 
 const (
-	statusBufferLimit           = int64(10)
+	statusBufferLimit           = int64(1)
 	statusBufferDropCounterName = "status_dropped_buffer_limit_exceeded"
 )
 
@@ -394,8 +394,11 @@ func (p *Plugin) loop(ctx context.Context) {
 			p.reconfigure(update.config)
 			update.done <- struct{}{}
 		case respCh := <-p.queryCh:
+			p.readBundleStatus()
 			respCh <- p.snapshot()
 		case update := <-p.trigger:
+			// make sure the more recent status is registered
+			p.readBundleStatus()
 			err := p.oneShot(update.ctx)
 			if err != nil {
 				p.logger.Error("%v.", err)
@@ -414,6 +417,16 @@ func (p *Plugin) loop(ctx context.Context) {
 	}
 }
 
+// readBundleStatus is a non-blocking read to make sure the latest status is received
+func (p *Plugin) readBundleStatus() {
+	select {
+	case status := <-p.bulkBundleCh:
+		p.lastBundleStatuses = status
+	case status := <-p.bundleCh:
+		p.lastBundleStatus = &status
+	default:
+	}
+}
 func (p *Plugin) oneShot(ctx context.Context) error {
 	req := p.snapshot()
 

v1/plugins/status/plugin_test.go

@@ -48,15 +48,15 @@ func TestStatusUpdateBuffer(t *testing.T) {
 		expectedNameDropped   string
 	}{
 		{
-			name:                  "add one over the limit and drop oldest",
+			name:                  "add multiple events dropping the oldest",
 			numberOfStatusUpdates: 11,
-			expectedStatusUpdates: 10,
+			expectedStatusUpdates: 1,
 			expectedNameDropped:   "0",
 		},
 		{
 			name:                  "don't drop anything",
 			numberOfStatusUpdates: 5,
-			expectedStatusUpdates: 5,
+			expectedStatusUpdates: 1,
 		},
 	}